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Binary colloidal structures assembled through Ising interactions

Author

Listed:
  • Karim S. Khalil

    (Duke University, Center for Biologically Inspired Materials and Material Systems)

  • Amanda Sagastegui

    (Duke University, Center for Biologically Inspired Materials and Material Systems)

  • Yu Li

    (University of Michigan—Shanghai Jiao Tong University Joint Institute, Shanghai Jiao Tong University)

  • Mukarram A. Tahir

    (Duke University, Center for Biologically Inspired Materials and Material Systems)

  • Joshua E. S. Socolar

    (Duke University, PO Box 90305, Durham, North Carolina 27708, USA.)

  • Benjamin J. Wiley

    (Duke University, PO Box 90354, Durham, North Carolina 27708, USA.)

  • Benjamin B. Yellen

    (Duke University, Center for Biologically Inspired Materials and Material Systems
    University of Michigan—Shanghai Jiao Tong University Joint Institute, Shanghai Jiao Tong University)

Abstract

New methods for inducing microscopic particles to assemble into useful macroscopic structures could open pathways for fabricating complex materials that cannot be produced by lithographic methods. Here we demonstrate a colloidal assembly technique that uses two parameters to tune the assembly of over 20 different pre-programmed structures, including kagome, honeycomb and square lattices, as well as various chain and ring configurations. We programme the assembled structures by controlling the relative concentrations and interaction strengths between spherical magnetic and non-magnetic beads, which behave as paramagnetic or diamagnetic dipoles when immersed in a ferrofluid. A comparison of our experimental observations with potential energy calculations suggests that the lowest energy configuration within binary mixtures is determined entirely by the relative dipole strengths and their relative concentrations.

Suggested Citation

  • Karim S. Khalil & Amanda Sagastegui & Yu Li & Mukarram A. Tahir & Joshua E. S. Socolar & Benjamin J. Wiley & Benjamin B. Yellen, 2012. "Binary colloidal structures assembled through Ising interactions," Nature Communications, Nature, vol. 3(1), pages 1-8, January.
    • Handle: RePEc:nat:natcom:v:3:y:2012:i:1:d:10.1038_ncomms1798
    DOI: 10.1038/ncomms1798
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